fix(virtual): skip items update if height has not been checked (#21442)

grolu · web-flow · commit 2e55ed3d30da · 2025-06-30T16:39:43.000+10:00
fixes #18806
diff --git a/packages/vuetify/src/composables/virtual.ts b/packages/vuetify/src/composables/virtual.ts
@@ -197,7 +197,7 @@ export function useVirtual <T> (props: VirtualProps, items: Ref<readonly T[]>) {
     raf = requestAnimationFrame(_calculateVisibleItems)
   }
   function _calculateVisibleItems () {
-    if (!containerRef.value || !viewportHeight.value) return
+    if (!containerRef.value || !viewportHeight.value || !itemHeight.value) return
     const scrollTop = lastScrollTop - markerOffset
     const direction = Math.sign(scrollVelocity)
 

Original file line number	Diff line number	Diff line change
`@@ -197,7 +197,7 @@ export function useVirtual <T> (props: VirtualProps, items: Ref<readonly T[]>) {`
`197`	`197`	`raf = requestAnimationFrame(_calculateVisibleItems)`
`198`	`198`	`}`
`199`	`199`	`function _calculateVisibleItems () {`
`200`		`- if (!containerRef.value \|\| !viewportHeight.value) return`
	`200`	`+ if (!containerRef.value \|\| !viewportHeight.value \|\| !itemHeight.value) return`
`201`	`201`	`const scrollTop = lastScrollTop - markerOffset`
`202`	`202`	`const direction = Math.sign(scrollVelocity)`
`203`	`203`